磷渣混凝土的力学和抗冻性试验研究

Experimental study on mechanics and frost resistance of concrete with phosphorus slag

基于磷渣的活性效应研究了不同掺量磷渣对混凝土水化热、抗压强度的影响,通过慢冻法研究了磷渣混凝土的抗冻性特性。采用压汞法探究了磷渣对混凝土孔结构的影响。结果表明:随着磷渣掺量的增加,水泥浆体的水化热减小;混凝土抗压强度先提高后降低,掺20%磷渣混凝土的抗压强度最高;不掺磷渣、掺20%、40%磷渣混凝土养护60 d的孔隙率分别为26.6%、21.7%和30.9%;冻融循环120次后,掺40%磷渣混凝土的孔隙率由冻融前的30.9%增大到41.3%。

The effect of different content of phosphorus slag on the hydration heat and compressive strength of concrete was studied based on the active effect of phosphorus slag. The frost resistance characteristics of concrete with phosphorus slag were studied by slow freezing method. The effect of phosphorus slag on the pore structure of concrete was investigated by mercury in- trusion porosimetry. The results show that with the increase of phosphorus slag content,the hydration heat of concrete decreases. The compressive strength first increases then decreases, compressive strength of concrete with 20% phosphorus slag is the highest. The porosity of concrete without phosphorus slag, the porosity of concrete with 20% phosphorus slag,the porosity of concrete with 40% phosphorus slag were 26.6%,21.7% and 30.9% when curing for 60 d, respectively. The porosity of concrete with 40% phosphorus slag increased from 30.9% to 41.3% after freeze-thaw 120 cycles.